1281233888 has 24 divisors (see below), whose sum is σ = 2751741720. Its totient is φ = 582378880.

The previous prime is 1281233881. The next prime is 1281233893. The reversal of 1281233888 is 8883321821.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281233881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819583 + ... + 1820286.

It is an arithmetic number, because the mean of its divisors is an integer number (114655905).

Almost surely, 2^1281233888 is an apocalyptic number.

It is an amenable number.

1281233888 is an abundant number, since it is smaller than the sum of its proper divisors (1470507832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281233888 is a wasteful number, since it uses less digits than its factorization.

1281233888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639890 (or 3639882 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 1281233888 is about 35794.3275953048. The cubic root of 1281233888 is about 1086.1158186890.

The spelling of 1281233888 in words is "one billion, two hundred eighty-one million, two hundred thirty-three thousand, eight hundred eighty-eight".